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Particulate Matter Sensor Calibration - Patent 8131495

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BACKGROUND A diesel particulate filter (DPF) traps particulate matter (PM) or soot in exhaust discharged from an engine. With increased soot loading in the DPF, exhaust flow resistance increases, engine performance deteriorates, and the DPF can bedamaged. Accumulated PM can be removed from a DPF using a process referred to as regeneration. Regeneration can be either actively initiated by an engine controller or it can be passively on-going such that a PM oxidation temperature is achieved duringnormal engine operation (high load leading to engine exhaust above the light-off temperature). BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. Like numerals having different letter suffixes may represent different instances of similar components. The drawingsillustrate generally, by way of example, but not by way of limitation, various embodiments discussed in the present document. FIG. 1 illustrates a system, according to an example embodiment. FIG. 2 illustrates a graph of voltage and time, according to an example embodiment. FIGS. 3A and 3B illustrate flow charts of methods, according to example embodiments.DETAILED DESCRIPTION Some regulatory agencies (such as the Environmental Protection Agency of the United States of America) impose requirements under which harmful particulate emissions from an engine are limited and under which a manufacturer is obligated tocertify that their products are operating properly in service. An accurately calibrated PM sensor can be used to meet these regulatory requirements. FIG. 1 illustrates system 10 including engine 12, fuel/air controller 16, processor 14, filter 18, and sensor 30. Engine 12 can include an internal combustion engine. Engine 12 can include any of a variety of powerplants, including a diesel engine for use with diesel fuel. Engine 12 can be naturally aspirated or have forced induction (e.g., turbochargedor

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